Hydraulic oil replenishment system and method for a diaphragm compressor

Abstract

A kind of hydraulic oil supplement system and supplement method of diaphragm compressor, control module judges that oil discharge pressure signal is less than the preset low alarm threshold of oil discharge pressure, and exhaust pressure signal is less than the preset low alarm threshold of exhaust pressure, and exhaust flow signal is greater than the preset high alarm threshold of exhaust flow, then control module will action instruction be given to actuating mechanism, actuating mechanism automatically rotates the adjusting screw cover on oil supplement plunger pump, it moves towards the direction of eccentric sleeve, to increase the movement stroke of plunger, to increase the oil supplement amount of oil supplement plunger pump.The present application can adjust the oil supplement amount of oil supplement plunger pump on line without stopping diaphragm compressor and disassembling cylinder head component, to supplement the hydraulic oil that leakage increases due to piston sealing element failure or sealing performance weakening of diaphragm compressor, reduce the great workload brought by shutdown replacement sealing element, and avoid the economic loss caused by shutdown.

Description

Technical Field

[0001] This invention relates to the field of diaphragm compressors, and more particularly to a hydraulic oil replenishment system and method for diaphragm compressors. Background Technology

[0002] A diaphragm compressor is a special type of positive displacement compressor, representing the highest level of compression in the field of gas compression. It features a high compression ratio, excellent sealing, and protection against contamination from lubricating oil and other solid impurities. Widely used for compressing and transporting various high-purity gases, precious and rare gases, toxic and harmful gases, and corrosive gases, it is an irreplaceable type of positive displacement compressor and will see even wider applications with advancements in science and technology and the continuous improvement of people's living standards. Diaphragm compressors use a piston rod to push hydraulic oil to pressurize the gas. The piston rod and cylinder liner have a clearance fit. To reduce hydraulic oil leakage from this gap, sealing measures are necessary. Currently, rubber sealing rings are commonly used. These rings are installed in the annular groove of the piston rod, and during operation, the outer edge of the sealing ring is pressed tightly against the mirror surface of the cylinder liner, thus preventing hydraulic oil leakage from the gap. The piston rod and cylinder liner are dynamically sealed. When the diaphragm compressor is running, the outer edge of the seal ring will be worn. As the running time increases, the wear of the seal ring will become more and more serious, which will weaken the sealing function of the seal ring and lead to an increase in the leakage of hydraulic oil.

[0003] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic oil replenishment system and method for a diaphragm compressor. This system allows for online adjustment of the replenishment amount of the replenishment plunger pump without shutting down the diaphragm compressor or disassembling the cylinder head components. This compensates for increased hydraulic oil leakage caused by piston seal failure or weakened sealing performance in the diaphragm compressor, reducing the increased workload associated with replacing seals during downtime and avoiding economic losses caused by downtime.

[0005] To achieve the above objectives, the present invention provides a hydraulic oil replenishment system for a diaphragm compressor, comprising:

[0006] An oil inlet valve is provided on the housing of the diaphragm compressor and communicates with the oil chamber of the housing for adding hydraulic oil to the oil chamber;

[0007] An oil drain valve is installed on the housing of the diaphragm compressor, communicates with the oil chamber of the housing and the cylinder of the diaphragm compressor, and is used to replenish the hydraulic oil in the oil chamber to the cylinder of the diaphragm compressor.

[0008] An oil replenishing plunger pump, installed on the housing of the diaphragm compressor, is used to replenish hydraulic oil to the diaphragm compressor. The oil replenishing plunger pump includes a plunger, a plunger sleeve, and a spring. The plunger is disposed in the oil chamber of the housing, and a plunger sleeve is provided on the plunger. The upper end of the plunger extends out of the oil chamber and contacts a bearing on the eccentric sleeve of the crankshaft of the diaphragm compressor. The eccentric sleeve drives the plunger to move downward through the bearing. A spring is provided at the lower end of the plunger. The plunger has a stepped portion for use with an adjusting screw cap to limit the plunger's position.

[0009] An adjusting screw cap is provided on the housing of the diaphragm compressor for adjusting the stroke of the plunger. The adjusting screw cap has a cover plate and a limiting part located below the cover plate. The cover plate and the limiting part have through holes. The upper end of the plunger passes through the through hole and faces the bearing end face on the eccentric sleeve. The limiting part locks the stepped part of the plunger to limit the plunger.

[0010] The data acquisition module is used to acquire real-time data on the oil discharge and exhaust status of the diaphragm compressor.

[0011] The control module, which is connected to the data acquisition module and the oil replenishing plunger pump, is used to adjust the oil replenishment amount of the oil replenishing plunger pump in real time according to the oil discharge and exhaust status of the diaphragm compressor.

[0012] The outer wall of the limiting part is provided with external threads, the inner wall of the housing is provided with internal threads, and the adjusting screw cap and the housing are fixedly connected by threads.

[0013] The hydraulic oil replenishment system also includes an actuator that automatically rotates the adjusting screw cap according to the action command of the control module to adjust the stroke of the plunger, thereby adjusting the replenishment amount of the replenishing plunger pump.

[0014] The diameter of the through hole is 0.5 mm to 1.5 mm larger than the diameter of the plunger.

[0015] The hydraulic oil replenishment system also includes a monitoring terminal connected to the control module for real-time display of the oil discharge and exhaust status of the diaphragm compressor.

[0016] The data acquisition module includes:

[0017] An oil discharge pressure acquisition module is installed on the cylinder of the diaphragm compressor to acquire the oil discharge pressure signal of the diaphragm compressor in real time and transmit it to the control module.

[0018] An exhaust pressure acquisition module is installed on the exhaust line of the diaphragm compressor to acquire the exhaust pressure signal of the diaphragm compressor in real time and transmit it to the control module.

[0019] An exhaust flow acquisition module is installed on the exhaust line of the diaphragm compressor to acquire the exhaust flow signal of the diaphragm compressor in real time and transmit it to the control module.

[0020] The adjusting screw cap further includes: a plurality of ribs, the ribs being connected to the cover plate and located outside the housing, the plurality of ribs being evenly distributed at intervals along the circumferential direction.

[0021] The present invention also provides a method for replenishing hydraulic oil in a diaphragm compressor, comprising the following steps:

[0022] The control module acquires the oil discharge pressure signal P of the diaphragm compressor acquired in real time by the oil discharge pressure acquisition module, the discharge pressure signal P0 of the diaphragm compressor acquired in real time by the discharge pressure acquisition module, and the discharge flow signal G0 of the diaphragm compressor 1 acquired in real time by the discharge flow acquisition module.

[0023] If the control module determines that the oil discharge pressure signal P is less than the preset low oil discharge pressure alarm threshold P2, the exhaust pressure signal P0 is less than the preset low exhaust pressure alarm threshold P3, and the exhaust flow signal G0 is greater than the preset high exhaust flow alarm threshold G1, then the control module will transmit the action command to the actuator. The actuator will automatically rotate the adjusting screw cap so that it moves toward the eccentric sleeve until the oil discharge pressure signal P is greater than the preset low oil discharge pressure alarm threshold P2.

[0024] If the control module determines that the oil discharge pressure signal P is greater than the preset high oil discharge pressure alarm threshold P1, the operator needs to check the operating status of the pressure regulating valve and its pipeline of the diaphragm compressor and adjust its unloading pressure to the design value.

[0025] The control module controls the actuator to adjust the adjusting screw cap to move one unit length toward the eccentric sleeve each time. The unit length is one screw pitch, or the quotient of a single screw pitch divided by the total number of ribs.

[0026] The present invention has the following beneficial effects:

[0027] 1. The structure is simple; it only requires drilling threads on the housing of the oil replenishing plunger pump and installing an adjusting screw cap.

[0028] 2. The oil supply of the oil replenishing plunger pump can be adjusted online without stopping the diaphragm compressor or disassembling the cylinder head components. This compensates for the increased leakage of hydraulic oil caused by the failure or weakening of the piston seals of the diaphragm compressor, reducing the workload of replacing seals during shutdown and avoiding economic losses caused by shutdown. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the oil replenishment structure of a diaphragm compressor.

[0030] Figure 2 This is a schematic diagram of the hydraulic oil replenishment system for a diaphragm compressor provided by the present invention.

[0031] Figure 3 This is a cross-sectional schematic diagram of the replenishing plunger pump.

[0032] Figure 4 This is a schematic diagram of the adjusting screw cap.

[0033] Figure 5 This is a flowchart of a hydraulic oil replenishment method for a diaphragm compressor provided by the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1: Diaphragm compressor

[0036] 10: Bearings

[0037] 11: Cylinder Block

[0038] 12: Piston

[0039] 13: Cylinder head

[0040] 14: Make-up plunger pump

[0041] 15: Crankshaft

[0042] 16: Overflow valve

[0043] 17: Oil Discharge Pressure Acquisition Module

[0044] 18: Exhaust pressure acquisition module

[0045] 19: Exhaust Flow Acquisition Module

[0046] 101: Shell

[0047] 1011: Oil cavity

[0048] 102: Oil inlet valve

[0049] 103: Oil drain valve

[0050] 104: Plunger

[0051] 1041: Step section

[0052] 105: Plunger sleeve

[0053] 106: Spring

[0054] 107: Adjusting screw cap

[0055] 1071: Cover plate

[0056] 1072: Limiting part

[0057] 1073: Through hole

[0058] 1074: Ribs

[0059] 108: Connector Detailed Implementation

[0060] The following is based on Figures 1-5 The preferred embodiments of the present invention will be described in detail below.

[0061] When the seals on the piston rod of a diaphragm compressor wear out, in order to ensure the normal operation of the diaphragm compressor and guarantee the design discharge pressure, there are three main approaches:

[0062] 1. Stop the operation of the diaphragm compressor, disassemble and replace the new sealing ring. This method requires shutdown, which is not only labor-intensive but also causes economic losses.

[0063] 2. Reduce the clearance between the piston rod or the piston and cylinder liner. This method also requires stopping the machine and involves a lot of work.

[0064] 3. Increase the amount of oil replenishment. During each revolution of the diaphragm compressor, oil is replenished to the cylinder through the oil replenishment plunger pump to replenish the hydraulic oil leaking from the piston rod or between the piston and the cylinder liner.

[0065] like Figure 1As shown, during the operation of the diaphragm compressor 1, the oil in the hydraulic oil chamber inevitably leaks through the piston 12 inside the cylinder block 11. This results in a reduction in the piston stroke volume, preventing the diaphragm from contacting the cylinder head 13 when the piston 12 reaches outer dead center. Since leakage occurs with each revolution of the diaphragm compressor, the amount of liquid in the hydraulic oil chamber decreases over time, preventing the diaphragm from contacting the cylinder head 13 and ultimately causing the compressor to lose its ability to draw in gas. Therefore, a replenishing plunger pump 14 is necessary to replenish the hydraulic oil chamber of the diaphragm compressor. The plunger in the replenishing plunger pump 14 is driven by a bearing mounted on an eccentric sleeve on the crankshaft 15, replenishing a certain amount of liquid to the hydraulic oil chamber of the diaphragm compressor with each revolution. Because the amount of liquid replenished by the replenishing plunger pump 14 cannot be guaranteed to be exactly the amount of liquid leaking from the hydraulic oil chamber of the diaphragm compressor, the replenishment amount must be greater than the leakage amount. Excessive hydraulic fluid replenishment effectively increases the stroke of piston 12, causing the diaphragm to adhere to the surface of cylinder head 13 before piston 12 reaches outer dead center. Because hydraulic oil has low compressibility, the fluid for the remaining piston stroke must be discharged through the relief valve 16 on the distributor plate. In diaphragm compressors, hydraulic oil is compressible. For example, when the pressure of mineral oil is increased from 0.1 MPa to 20 MPa, the volume of mineral oil decreases by approximately 1.4%; when the pressure increases to 50 MPa, the volume decreases by approximately 3%; when increased to 80 MPa, the volume decreases by 4.3%; and when increased to 351.5 MPa, the volume decrease reaches 15%. Therefore, using the same amount of replenishment fluid cannot guarantee that the diaphragm will adhere to the lower surface of the cylinder head. This necessitates replenishing a larger amount of hydraulic oil per revolution to compensate for the compression of the hydraulic oil under high pressure. Oil replenishment is performed at a position before the piston 12 reaches inner dead center. When the piston 12 is at inner dead center, the stroke of the oil replenishment plunger pump 14 reaches its maximum, completing the oil replenishment. In this way, the oil replenishment plunger pump 14 will operate under a corresponding low pressure, which not only reduces the design difficulty of the oil replenishment system but also improves the operational safety of the diaphragm compressor.

[0066] Based on this, such as Figure 2 As shown, the present invention provides a hydraulic oil replenishment system for a diaphragm compressor, comprising: an oil inlet valve 102, which is disposed on the housing 101 of the diaphragm compressor 1 and communicates with the oil chamber 1011 of the housing 101, for adding hydraulic oil to the oil chamber 1011;

[0067] The oil drain valve 103 is disposed on the housing 101 of the diaphragm compressor 1, communicates with the oil chamber 1011 of the housing 101, and communicates with the cylinder 11 of the diaphragm compressor 1, and is used to replenish the hydraulic oil in the oil chamber 1011 to the cylinder 11 of the diaphragm compressor 1.

[0068] The data acquisition module is used to acquire real-time oil discharge and exhaust status data of the diaphragm compressor 1;

[0069] A replenishing plunger pump 14, mounted on the housing 101 of the diaphragm compressor 1, is used to replenish hydraulic oil to the diaphragm compressor 1; for example... Figure 3 As shown, the oil replenishing plunger pump 14 includes: a plunger 104, a plunger sleeve 105, and a spring 106. The plunger 104 is disposed in the oil chamber 1011 of the housing 101. The plunger sleeve 105 is disposed on the plunger 104. The upper end of the plunger 104 extends out of the oil chamber 1011 and contacts the bearing 10 on the eccentric sleeve of the crankshaft 15 of the diaphragm compressor 1 through the connecting member 108. The eccentric sleeve drives the plunger 104 to move downward through the bearing 10. The lower end of the plunger 104 is disposed with a spring 106, which is also located in the oil chamber 1011. Furthermore, the plunger 104 has a stepped portion 1041, which is used to cooperate with the adjusting screw cap 107 to limit the position of the plunger 104.

[0070] Adjust the screw cap 107, as follows Figure 4 As shown, the adjusting screw cap 107 is disposed on the housing 101 to limit the position of the plunger 104; the adjusting screw cap 107 has a cover plate 1071 and a limiting part 1072 located below the cover plate 1071. The cover plate 1071 and the limiting part 1072 have through holes 1073. The upper end of the plunger 104 passes through the through hole 1073 and faces the end face of the bearing 10 of the eccentric sleeve. In this embodiment, the diameter of the through hole 1073 is 0.5mm to 1.5mm larger than the diameter of the plunger 104, so that the plunger 104 can move freely inside the through hole 1073; the limiting part 1072 locks the stepped part 1041 of the plunger 104 to limit the plunger 104. The outer wall of the limiting part 1072 is provided with external threads. Correspondingly, the inner wall of the housing 101 is provided with internal threads. The adjusting screw cap 107 and the housing 101 are fixedly connected by threads.

[0071] The control module (not shown in the figure) is connected to the data acquisition module and the oil replenishing plunger pump 14, and is used to adjust the oil replenishment amount of the oil replenishing plunger pump 14 in real time according to the oil discharge and exhaust status of the diaphragm compressor 1.

[0072] The actuator (not shown in the figure) automatically rotates the adjusting screw cap 107 according to the action command of the control module to adjust the volume of the oil chamber 1011, thereby adjusting the oil replenishment amount of the oil replenishment plunger pump 14.

[0073] The monitoring terminal (not shown in the figure) is connected to the control module and is used to display the oil discharge and exhaust status of the diaphragm compressor 1 in real time.

[0074] The data acquisition module includes:

[0075] The oil discharge pressure acquisition module 17 is installed on the cylinder 11 of the diaphragm compressor 1 and is used to acquire the oil discharge pressure signal of the diaphragm compressor 1 in real time and transmit it to the control module.

[0076] The exhaust pressure acquisition module 18 is installed on the exhaust pipeline of the diaphragm compressor 1 and is used to acquire the exhaust pressure signal of the diaphragm compressor 1 in real time and transmit it to the control module.

[0077] The exhaust flow acquisition module 19 is installed on the exhaust pipeline of the diaphragm compressor 1 and is used to acquire the exhaust flow signal of the diaphragm compressor 1 in real time and transmit it to the control module.

[0078] like Figure 3 As shown, the adjusting cap 107 is threadedly installed on the housing 101 of the oil replenishing plunger pump 14. During initial installation, the adjusting cap 107 is screwed down completely, causing the limiting part 1072 of the adjusting cap 107 to press against the stepped part 1041 of the plunger 104, preventing the plunger 104 from moving upwards under the action of the spring 106; this is the top dead center of the plunger. During diaphragm compressor operation, under the action of the eccentric sleeve, the plunger 104 moves downwards with each crankshaft rotation, replenishing oil to the hydraulic cylinder of the diaphragm compressor through the oil discharge valve 103. During the downward movement, the plunger 104 compresses the spring 106 until the plunger 104 reaches its lowest point, which is the bottom dead center of the plunger. When the bearing 10 of the eccentric sleeve moves away from the plunger 104, the plunger 104 moves upward under the action of the spring force. At this time, hydraulic oil enters the oil chamber 1011 of the replenishing plunger pump 14 from the oil inlet valve 102 until the plunger 104 moves to the top dead center. The volume of the oil chamber between the top dead center and the bottom dead center is the initial replenishment amount. Rotating the adjusting cap 107 so that it moves towards the bearing 10 of the eccentric sleeve, the top dead center of the plunger also moves upward, which is equivalent to increasing the stroke of the plunger 104. The volume of the oil chamber between the top dead center and the bottom dead center also expands, and correspondingly, the replenishment amount of the replenishing plunger pump 14 also increases.

[0079] In embodiments of the present invention, such as Figure 4As shown in the figure, a plurality of rib plates 1074 are provided on the adjustment screw cap 107. The rib plates 1074 connect the cover plate 1071, and the rib plates 1074 are located outside the housing 101. The plurality of rib plates 1074 are evenly distributed at equal intervals in the circumferential direction. Since the rib plates 1074 are distributed at equal intervals, when the adjustment screw cap 107 rotates 360°, the distance that the adjustment screw cap 107 moves in the axial direction of its axis is one pitch. According to the number of the rib plates 1074, the angle between two rib plates can be calculated. During the rotation of the adjustment screw cap 107, the rib plates 1074 move accordingly. The axial movement distance of the adjustment screw cap 107 can be calculated through the rotation angle of the rib plates 1074, so as to accurately control the increase amount of the oil supply of the oil supply plunger pump 14. The number of the rib plates 1074 is not fixed. The more the number, the more accurate the control angle during installation and the more accurate the control of the axial movement distance of the adjustment screw cap 107. However, the number of rib plates should not be set too many. On the one hand, considering the strength factor, the rib plates cannot be too small. On the other hand, the adjustment screw cap 107 moves one pitch axially only when it rotates one circle, and the pitch is already small, so there is no need for too many rib plates. Generally, it is more appropriate to set the number of the rib plates 1074 to 6-10.

[0080] Further, in this embodiment, the actuator includes: a motor, a gear and a control board. A gear is installed on the output shaft of the motor. The gear meshes with the rib plates 1074 on the adjustment screw cap 107. The rotation of the motor is controlled by the control board. When the control board receives an adjustment instruction from the control module, it controls the motor to rotate. The motor drives the gear to rotate, so that the rib plates 1074 push the adjustment screw cap 107 to rotate. The rotation of the adjustment screw cap 107 is converted into an axial displacement, thereby increasing the oil supply amount.

[0081] As Figure 5 shown, the present invention provides a method for supplementing hydraulic oil of a diaphragm compressor, including the following steps:

[0082] Step S1: The oil discharge pressure acquisition module 17 continuously acquires the oil discharge pressure signal P of the diaphragm compressor 1 and transmits it to the control module; the exhaust pressure acquisition module 18 continuously acquires the exhaust pressure signal P0 of the diaphragm compressor 1 and transmits it to the control module; the exhaust gas flow acquisition module 19 continuously acquires the exhaust gas flow signal G0 of the diaphragm compressor 1 and transmits it to the control module;

[0083] Step S_{2}: The control module determines the difference between the oil discharge pressure signal P and the preset high alarm threshold P1 of the oil discharge pressure and the preset low alarm threshold P2 of the oil discharge pressure. If P<P2, step S3 is performed. If P2≤P≤P1, it means that the diaphragm compressor is operating normally and no oil needs to be supplemented. If P>P1, step S5 is performed;

[0084] Step S3: The control module determines whether the exhaust pressure is low (i.e., P0 < P3, where P3 is the preset low alarm threshold for exhaust pressure) and whether the exhaust flow rate is high (i.e., G0 > G1, where G1 is the preset high alarm threshold for exhaust flow rate). If so and additional oil supply is required, proceed to Step S4;

[0085] Step S4: The control module transmits an action instruction to the actuator. The actuator automatically rotates the adjusting screw cap 107 in the direction of the bearing 10 of the eccentric sleeve, which is equivalent to increasing the stroke volume of the piston 104, thereby increasing the volume of the oil chamber 1011, and thus increasing the oil supply of the oil supply plunger pump 14. Correspondingly, the piston stroke volume of the diaphragm compressor increases, the peak oil pressure increases, and then the exhaust pressure increases; then proceed to Step S1; The control module can control the actuator to adjust the adjusting screw cap 107 to move one unit length in the direction of the bearing 10 of the eccentric sleeve each time, and repeat Steps S1 - S4 until P2 < P < P1, at which point the control module stops alarming; The unit length can be set according to specific circumstances. For example, it can be set as one pitch, or according to the number of rib plates, set as the quotient of a single pitch divided by the total number of rib plates;

[0086] Step S5: When the high oil discharge pressure alarm occurs, the operator needs to check the operating status of the pressure regulating valve and its pipeline of the diaphragm compressor, adjust its unloading pressure to the design value, and then proceed to Step S1.

[0087] The present invention can adjust the oil supply of the oil supply plunger pump without stopping the machine and disassembling components. When the piston seal wears and causes an increase in oil leakage, the hydraulic oil in the hydraulic cylinder is insufficient, which is equivalent to a decrease in the piston stroke volume. Then, when the piston is at the bottom dead center, the hydraulic oil pressure in the hydraulic cylinder will decrease, and the exhaust pressure will随之 decrease and be lower than the design value. To ensure that the exhaust pressure is maintained at the design level, it is necessary to increase the oil supply. At this time, the method for adjusting the oil supply provided by the present invention can be used to achieve on-line adjustment of the oil supply. The operation is simple, the oil supply of the oil supply plunger pump can be increased without stopping the machine, ensuring the piston stroke volume required by the design, and thus ensuring that the exhaust pressure is maintained at the design level, achieving the effect of compensating for the reduced hydraulic oil due to increased leakage, reducing the increased workload caused by stopping the machine to replace the seal, and avoiding the economic losses caused by stopping the machine.

[0088] It should be noted that, in the embodiments of the present invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0089] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0090] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A hydraulic oil replenishment system for a diaphragm compressor, characterized by, The oil inlet valve (102) is arranged on the shell (101) of the diaphragm compressor (1) and communicates with the oil cavity (1011) of the shell (101) to add hydraulic oil into the oil cavity (1011). The oil outlet valve (103) is arranged on the shell (101) of the diaphragm compressor (1) and communicates with the oil cavity (1011) of the shell (101) and the cylinder (11) of the diaphragm compressor (1) to supplement the hydraulic oil in the oil cavity (1011) into the cylinder (11) of the diaphragm compressor (1). The oil supplementing plunger pump (14) is installed on the shell (101) of the diaphragm compressor (1) to supplement hydraulic oil into the diaphragm compressor (1). The oil supplementing plunger pump (14) comprises a plunger (104), a plunger sleeve (105) and a spring (106). The plunger (104) is arranged in the oil cavity (1011) of the shell (101). The plunger (104) is provided with the plunger sleeve (105). The upper end of the plunger (104) extends out of the oil cavity (1011) and can be in contact with the bearing (10) on the eccentric sleeve of the crankshaft (15) of the diaphragm compressor (1). The eccentric sleeve drives the plunger (104) to move downward through the bearing (10). The lower end of the plunger (104) is provided with the spring (106). The plunger (104) has a stepped portion (1041) for cooperating with the adjusting screw cap (107) to limit the movement of the plunger (104). The adjusting screw cap (107) is arranged on the shell (101) of the diaphragm compressor (1) to adjust the movement stroke of the plunger (104). The adjusting screw cap (107) has a cover plate (1071) and a limiting portion (1072) below the cover plate (1071). The cover plate (1071) and the limiting portion (1072) have a through hole (1073). The upper end of the plunger (104) passes through the through hole (1073) and is opposite to the end face of the bearing (10) on the eccentric sleeve. The limiting portion (1072) clamps the stepped portion (1041) of the plunger (104) to limit the movement of the plunger (104). The data acquisition module is used to acquire the oil discharge and exhaust state data of the diaphragm compressor (1) in real time. The control module is connected with the data acquisition module and the oil supplementing plunger pump (14) to adjust the oil supplementing amount of the oil supplementing plunger pump (14) in real time according to the oil discharge and exhaust state of the diaphragm compressor (1). The outer wall of the limiting portion (1072) is provided with external threads, and the inner wall of the shell (101) is provided with internal threads. The adjusting screw cap (107) and the shell (101) are fixedly connected through threads.

2. The hydraulic oil replenishing system of the diaphragm compressor according to claim 1, wherein The hydraulic oil supplementing system further comprises an actuator which automatically rotates the adjusting screw cap (107) according to the action instruction of the control module to adjust the movement stroke of the plunger (104) and thus adjust the oil supplementing amount of the oil supplementing plunger pump (14).

3. The hydraulic oil replenishing system of the diaphragm compressor according to claim 1, wherein ​ 4. The hydraulic oil replenishing system of the diaphragm compressor according to claim 1, wherein The diameter of the through hole (1073) is 0.5mm-1.5mm larger than the diameter of the plunger (104).

5. The hydraulic oil replenishing system of the diaphragm compressor according to claim 1, wherein The hydraulic oil supplement system further comprises a monitoring terminal connected to the control module, for displaying the oil discharge and exhaust state of the diaphragm compressor (1) in real time.

6. The hydraulic oil replenishing system of the diaphragm compressor according to claim 1, wherein The data acquisition module comprises: An oil discharge pressure acquisition module (17) arranged on the cylinder (11) of the diaphragm compressor (1), for acquiring the oil discharge pressure signal of the diaphragm compressor (1) in real time and transmitting it to the control module; An exhaust pressure acquisition module (18) arranged on the exhaust pipeline of the diaphragm compressor (1), for acquiring the exhaust pressure signal of the diaphragm compressor (1) in real time and transmitting it to the control module; An exhaust flow acquisition module (19) arranged on the exhaust pipeline of the diaphragm compressor (1), for acquiring the exhaust flow signal of the diaphragm compressor (1) in real time and transmitting it to the control module.

7. The hydraulic oil replenishing system of the diaphragm compressor according to claim 1, wherein The adjusting screw cover (107) further comprises a plurality of rib plates (1074) connected to the cover plate (1071) and located outside the shell (101), and the rib plates (1074) are evenly distributed along the circumferential direction.

8. A hydraulic oil replenishment method for a diaphragm compressor using the hydraulic oil replenishment system according to any one of claims 1 to 7, characterized by, The method comprises the following steps: The control module acquires the oil discharge pressure signal P of the diaphragm compressor (1) acquired by the oil discharge pressure acquisition module (17) in real time, the exhaust pressure signal P0 of the diaphragm compressor (1) acquired by the exhaust pressure acquisition module (18) in real time, and the exhaust flow signal G0 of the diaphragm compressor (1) acquired by the exhaust flow acquisition module (19) in real time. If the control module determines that the oil discharge pressure signal P is less than the preset low oil discharge pressure alarm threshold P2, the exhaust pressure signal P0 is less than the preset low exhaust pressure alarm threshold P3, and the exhaust flow signal G0 is greater than the preset high exhaust flow alarm threshold G1, the control module transmits an action instruction to the actuator, and the actuator automatically rotates the adjusting screw cover (107) to move it towards the eccentric sleeve direction until the oil discharge pressure signal P is greater than the preset low oil discharge pressure alarm threshold P2.

9. The hydraulic oil replenishing method of a diaphragm compressor according to claim 8, wherein If the control module determines that the oil discharge pressure signal P is greater than the preset high oil discharge pressure alarm threshold P1, the operator needs to check the operating state of the pressure regulating valve and its pipeline of the diaphragm compressor (1) and adjust the unloading pressure to the design value.

10. The hydraulic oil replenishing method of a diaphragm compressor according to claim 8, wherein The control module controls the actuator to adjust the adjusting screw cover (107) to move towards the eccentric sleeve direction by one unit length each time, and the unit length is a pitch or a quotient of a single pitch divided by the total number of rib plates (1074).

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